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| Latin for "all lands"; land mass of all the continents fit together around 25 million years ago |
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| Theory that states that all the continents are constantly drifting on top of plates above the mantle due to convection currents |
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| The movement of molten rock, magma, from the interior of the mantle which is hot to the exterior of the mantle which is cooler |
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| Areas where plates move towards each other and collide, causing uplift |
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| Areas where plates move away from each other, forming either mid oceanic ridges or rift valleys |
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| Areas where two plates grind pass each other resulting in faults such as the San Andreas. Earthquake often occur at fault lines. |
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| Convergent boundary where an oceanic plate is push beneath a continental plate forming a trench. The oceanic crust melts resulting in the formation of volcanoes. |
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| A deep depression of the sea floor caused by subduction of one plate under another |
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| A large valley shaped area of the earth in which plates of the Earth's crust are moving away from each other, forming a system of cracks and faults |
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| Underwater mountain ranges where the crust is spreading apart causing the ocean floor |
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